Add ruby-3.3 and 3.4 in ci.yml (#221)

* Add ruby-3.3 and 3.4 in ci.yml

Adds support of ruby-3.3 and ruby-3.4 to test matrix

Author: boimw

.github/workflows/ci.yml

@@ -20,7 +20,8 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
-          - 'head'
+          - '3.3'
+          - '3.4'
         exclude:
           - ruby: '2.3'
             rack-version: '~> 3.0'